WordPress 4.9.8 is actually just a maintenance release but it comes with a very tasty treat.
The best thing about WordPress 4.9.8 is the "Try Gutenberg" feature. This lets you test the new Gutenberg block editor. With the upcoming release of Wordpress 5.0 in just a few weeks Gutenberg will become the new standard Wordpress Editor.
Important changes coming in WP 5
WordPress 4.9.8 allows users to test drive Gutenberg to see how their website theme and plugins will behave.
Recommendations to prepare for WP 5
To avoid indigestion when Gutenberg launches we recommend you taste the Gutenberg appetizer and prepare for the main course, WordPress 5.